Dental apparatus



May 22, 1934. Q H PIEPER, 1,959,964

DENTAL APPARATUS Filed April 27, 1932 3 Sheets-Sheet l [N VENTOR 06 car[[Paepar %zls A TTORNE V May 22, 1934. O P|EPER 1,959,964

DENTAL APPARATUS Filed April 27, 1932 3 Sheets-Sheet 5 415A TTORNEYPatented May 22, 1934 STATES PATENT OFFICE 26 Claims.

The present invention relates to dental apparatus and has for one objectto provide in conjunction with dental equipment stands, pedestals, andthe like, improved means for protecting the same against the effects ofdrippings discharging from various liquid holding parts connected withor carried by the stands as a result of condensation due to thedifferences in temperatures at the exterior surfaces of the parts andthe liquids or fluids therein, such as are provided for use by thedentist in connection with the treatment and care of the teeth.

A further object of the invention is to provide in conjunction witheither fixed or movable parts of the apparatus through which the liquidor fluid is permitted to flow, one or more receptacles for thecondensate dripping from the liquid holding parts in all positionsthereof and also to provide means for carrying off the drippingsdischarging to the receptacles.

A further object of the invention is to provide an improved mounting fora waste basin or other receptacle including a hollow or tubular supportforming. a liquid discharge conduit for carrying off the liquid from thebasin and having associated therewith a liquid supply connectionarranged to swing with the support about the axis thereof.

A further object of the invention is to provide an improved arrangementof liquid supply and discharge connections for a cuspidor bowl and otherliquid receiving devices, and also to provide means for intercepting andcarrying off the condensate discharging from one or more of the connections.

A further object of the invention is to provide improvements in theconstruction and mounting of drip catching receptacles and the like foruse in conjunction with dental equipment stands for receiving thecondensate forming on certain liquid supply or discharge conduits orother liquid holding parts carried by or connected with the stand.

To these and other ends the invention resides in certain improvementsand combinations of parts, all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

In the drawings:

Fig. 1 is a side elevation of a dental equipment stand embodying oneform of the invention;

Fig. 2 is a sectional elevation taken substantially on line 2a2a'of Fig.1;

Fig. 3 is a horizontal section taken approximately on line 3a-3a of Fig.1;

Fig. 4 is a fragmentary elevation drawn to an enlarged scale withcertain parts shown in section; and

Fig. 5 is a fragmentary sectional elevation of a modified form of theinvention.

The same reference numerals throughout the several views indicate thesame parts.

The invention relates to dental apparatus and more particularly toimprovements relating to dental equipment stands or pedestals of thetype adapted to support a variety of dental equipment adjacent thedental chair, including in part the cuspidor bowl, the drinking glassstand and waste basin, and the liquid supply and discharge conduitsassociated therewith, any of which parts may be of the fixed or movabletype. Serious objections have been encountered in this class ofapparatus owing to disfiguration and injury of the base or pedestal bythe continued dripping thereon of the condensate accumulating on certainoverlying parts containing the fluid or liquid used in connection withthe treatment of the teeth. I

The stand or pedestal is usually provided with a coating of enamel andit is found that the condensate dripping from the different partsthrough which the liquid flows often causes the enamel to crack off atdifferent points. This is particularly true with respect to any exposededges of the pedestal with which the drippings come in contact or atpoints Where the enamel is relatively thin. A further objection to thedripping of the condensate upon the pedestal is that dust accumulates onthe surfaces over which the liquid fiows and as the liquid dries thedust hardens leaving streaks or spots which are very noticeable andwhich disfigure and spoil the appearance of the unit. Another seriousobjection is that Where the pedestal is made of aluminum, the condensateupon cracking ofthe enamel will at tack the aluminum causing it tocorrode, this being particularly true in parts of the country wheredifferent alkalis and other foreign substances are present in the water.Means for overcoming the objections pointed out above, in a practicaland satisfactory manner and without detracting from the appearance ofthe dental unit will subsequently be described.

The invention also contemplates improved mountings and connections forthe Water supply leading to and from the cuspidor and the drinking glassstand and other parts as set forth hereinafter.

Referring to the drawings, 10 represents a hollow supporting column orpedestal preferably in the form of a casting which rests at its bottomon a base 11. The pedestal branches at its upper end into oppositelyarranged arm-like extensions 12 and 13, the former of which is designedto support different dental equipment units, such, for example, as anelectric motor and an instrument tray, not shown. The extension 13 formsa support for the cuspidor bowl 14 and also a hollow arm or support 15having thereon a waste basin l6 and a drinking glass stand or holder 17.The arm 15 is preferably disposed directly over the upper wall orcentral body portion 18 of the pedestal lying between the opposingextensions 12 and 13 and shaped in crosssection as best shown in Fig. 2.

The water for flushing the cuspidor and for the drinking supply iscarried upwardly through a supply pipe 19 disposed within the pedestaland extending through the wall 18 thereof shown in Fig. 4 where it isconnected with an overlying head 20. Extending from the head is aconnection 21 which leads into the arm 15 and is connected therein witha suitable valve, a portion of which is indicated at 22, Fig. 4.Connected with and extending from the valve into the cuspidor bowl is apipe 23 terminating in a nozzle 24 for discharging water to the bowl toflush the same. The drinking glass, not shown, which is carried by thestand or holder 17 is supplied with water by means of a pipe 25connected with the valve and extending from the arm 15 upwardly abovethe waste basin 16 in position to discharge thereto. The waste basin isin communication with and discharges through the arm 15 beneath thecuspidor outlet, the latter being provided with a suitable trap, notshown, which depends from the flared portion 26 of an annulus 27 seatedon the upper face of the hub 15a of the arm, 4. The lower reducedportion of the cuspidor 1 1 extends within the annulus and is preferablysecured by cementing it therein, the annulus being prevented fromturning by means of a pin 28 projecting within the wall of the hub 15aas shown in Fig. 4.

A drain pipe 29 is positioned within the pedestal for carrying off thewater discharging from the cuspidor and the basin 16, the pipe havingits upper end projecting within the extension 13 of the standard andconnected therein with a fixture or mounting 30 for holding the arm 15and bowl 14 upon the pedestal. The mounting has a flange 31 overlyingthe extension 13 and rests upon a gasket 32 thereon which affords aliquid tight joint between the parts. The mounting also has a flange 33slightly larger than the flange 31 which is disposed within and r stsupon the annular shoulder 34a of a ring 34 into which is threaded theextension 35 on the hub 15a of the arm 15. The bottom of the ring isseated upon the horizontal portion 36 of the receptacle 3'7 forreceiving the condensate which accumulates on the arm and whichdischarges therefrom into the receptacle, the latter being also seatedupon the gasket 32 on the pedestal extension 13 as shown in Fig. 4. Themounting 30, in addition to forming the mouth of the drain pipe 29 alsofunctions as means for securing the ring 3 and receptacle 3'? upon thepedestal extension 13. For this purpose a screw or bolt 38 is threadedwithin a lug 39 on the mounting, the screw being extended through thehorizontal wall portion 40 of the pedestal upon which the head of thescrew rests. By tightening the screw it will exert a downward pull onthe mounting, thus firmly clamping the flange 31 thereof upon theextremity of the extension 13 and also securing the flange 33 upon theshoulder of the ring 34 which in turn serves to secure the receptacle3'7 upon the extension. With this construction the arm 15 carrying thewaste basin 16 and the cuspidor bowl 14 is secured upon the pedestal,the arm discharging directly into the mounting, which forms a commonoutlet for the water flowing from the cuspidor bowl and the waste basin,and which together with the mounting and the conduit 29 forms a drainconnection for the basin 16 and the bowl 1s.

The means for preventing the condensate which accumulates upon anddischarges from the arm 15 from descending upon the pedestal is in theform of a receptacle 41 arranged beneath the arm and overlying thecurved body portion 18 of the pedestal as clearly shown in Figs. 1 and2. The receptacle is of the elongated dish-shaped type, designed toconform generally in outline to the curve of the upper body portion 18of the pedestal. The receptacle is so formed as not to detract from theappearance of the unit which has been constructed to afford anattractive and pleasing design which is highly desirable in equipment ofthis kind. The receptacle is supported in spaced relation to the wall 18of the pedestal by a pair of lugs .2 the lower ends of which rest uponseats 4=2a on the wall 18, the lugs being connected with the wall byscrews 43 extending downwardly through the lugs and threaded into saidwall.

At the lowest point of the receptacle an outlet opening 14: is providedwhich leads into a drain pipe 45 extending through the wall 18 of thepedestal and connected with a boss 46 on the bottom of the receptacle.The lower end of the pipe &5 is attached to a connection e'l carried bythe drain pipe 29 with which the connection communicates throughpassages, not shown whereby the condensate discharging from the arm 15and from the water supply connections leading thereto is carried off asfast as it accumulates.

The water supply pipe 19 is extended through the upper wall 18 of thepedestal and also through the bottom wall of the receptacle 41, as shownin Fig. 4. The bottom of the receptacle at the point through which thepipe extends is provided with a sleeve-like portion 48 projecting withinan opening formed in the wall 18 of the pedestal as best shown inFig. 1. Surrounding the pipe within the eeve is a flanged bushing i9preferably constructed of flexible or yieldable material and affording aliquid tight joint between. the pipe and sleeve while at the same timesealing the opening in the bottom of the receptacle through which thepipe extends. V

The end of the receptacle nearest the pedestal extension 13 is disposedbeneath the edge of the receptacle 3'7 on the extension and thecondensate accumulating in the last mentioned receptacle is dischargedthrough an opening 50 in the wall thereof to the elongated receptacle 41overlying the central body portion of the pedestal. It will be seen,therefore, that means is provided for receiving and carrying off all ofthe condensate which drips from the. arm 15 and associated parts, andthat the pedestal is thus protected against injury and disflguration bythe drippings;

The main difference in the modification shown in Fig. 5 over that shownin the remaining figures is that the arm 15 instead of being flxedagainst movement on the pedestal extension 13 is mounted for a swingingmovement about the axis of the cuspidor bowl in order that the wastebasin and drinking glass stand may be readily adjusted to differentpositions for use by the patient. This makes it necessary for thedrip-catching receptacle which extends beneath the arm to move with thelatter and requires also that the horizontal section of the water supplypipe leading to the valve within the arm be mounted to swing with thearm about the axis thereof. In the modified construction the partssimilar to those of the preferred construction are given correspondingreference characters. In thm modified construction the mounting 30areceives the liquid discharging from the cuspidor l4 and arm 15 and theflange 31 of the mounting is clamped upon the gasket 32 by tighteningthe bolt 38. The flange 34a of the ring 34 extends beneath the flange 33of the mounting and is free to rotate upon a rin shaped bearing plate 51resting upon the upper face of the drip-catching receptacle 37. The hub15a of the arm 15 is provided with an extension '52 which has anexteriorly threaded reduced portion 53 screwed into the ring 34 andsecured against turning therein by one or more set screws 54. With thisconstruction the arm 15 and the parts thereon including the bowl 14,extension 52, and the ring 54, are free to rotate about the axis of themounting 30a and while the mounting is clamped upon the pedestalextension it does not prevent rotation of the parts superimposedthereon, it being understood that the receptacle 3'7 is fixed to thepedestal extension by suitable means such for example as one or morescrews 37a.

The mounting 30a, which is preferably in the form of a casting, has onits vertical wall oppositely arranged communicating tubular members 55and 56, the latter terminating at its upper end on the axis of the arm15 and, having a coupling 57 rotatably receiving a short pipe 58 fromwhich extends a horizontally disposed pipe 59 the outer end of which isconnected with the head 20 on the pipe 21 leading to the valve 22 withinthe arm 15. The pipe 59 at the po nt where it passes through theextension 52 of the hub 15a is sealed by a bushing 60 aifording a liquidtight joint between the parts. The water "supply pipe 19 is connectedwith the tubular portion 55 of the mounting 30a by means of a coupling61. With the construction just described it will be apparent that thearm 15, the cuspidor 14, the basin 16 and other parts connected with thearm including the water supply connections above the tube 56, are freeto swing about the axis of the pedestal extension 13 to any positiondesired with respect to the dental chair most convenient to the patientor the operator.

The means for receiving the condensate accumulating upon the arm 15 andwater supply connections therebeneath preferably comprises an elongatedreceptacle 62 underlying said parts and inclined to the horizontal sothat it will readily drain into receptacle 3'7 over which the inner endof the receptacle 62 extends in any position of the arm 15 andassociated parts. The receptacle 62 may be suspended beneath the arm 15by any suitable means, but is preferably carried by the head 20 withwhich the water supply pipes 21 and 59 are connected, the receptaclebeing provided with boss-like portions 63 through which extend screws 64threaded within the wall of the head 20 at the under side thereof.

The drippings discharging from the opening 50 of the receptacle 3'? arereceived by the flared portion 65 of a short drain tube 66 extendingdownwardly through the wall 18 of the pedestal and received within asleeve 67 suitably formed on the drain pipe 29 and in communicationtherewith. The drain tube 66 is provided with a lug 68 resting upon thewall portion 18 of the pedestal and secured thereon by a screw 69.

In the modified construction shown in Fig. 5 it will be apparent thatthe condensate discharging from the arm 15 and associated parts will beintercepted by the receptacles 62 and 3'7 and will be carried oif by thedrain pipe 66 to the discharge pipe 29 thus preventing the possibilityof the discharge of the condensate upon any portion of the pedestal,regardless of whether or not the arm 15 is in the position shown oroverlies the upper central portion 18 of the pedestal, as it may do atdifferent times under diiierent operating conditions.

An important feature of the construction shown in the modified form ofthe invention aside from the provision of the drip-catching receptacles,is the novel manner of combining the water supply and drain pipeswhereby the eX- tension of the supply pipe 19 is carried through themounting 30a on the drain pipe 29 and constructed to receive and permitrotation of the short connection 58 on the horizontal supply pipe 59which is rigidly connected with the arm 15 and rotates with the latterto the different positions to which it is adjusted. Furthermore, themounting 300. also functions as a means for securing the cuspidor 14 andarm 15 upon the pedestal extension 13 while at the same time permittingrotation of said parts upon the pedestal extension.

I claim:

1. In dental apparatus, an upstanding pedestal, a hollow supportextending horizontally from and connected with the pedestal, areceptacle on the outer end of the support, means for supplying liquidto the receptacle from which it is discharged through the support, andmeans spaced from the receptacle and extending horizontally beneath thesupport and connected with the pedestal, said means being arranged toreceive the condensate forming upon and discharging from the exteriorsurface of the support.

2. In dental apparatus, a pedestal comprising a body portion having anextension thereon, a hollow arm overlying said body portion and havingone end connected with the extension, means arranged to deliver liquidto the other end of the arm, a receptacle beneath the arm overlying thebody of the pedestal arranged to receive the condensate forming upon anddischarging from the exterior surface of the arm, and means within thepedestal connected with the receptacle for conveying the liquidtherefrom.

3. In dental apparatus, a hollow pedestal hav ing a body portionprovided with an opening in its wall, a hollow arm overlying the bodyportion and having an outlet in registry with said opening, a dischargeconduit within the pedestal communicating with said outlet through theopening, means arranged to deliver liquid to the arm for dischargetherethrough to said conduit, and a receptacle beneath the arm overlyingthe body of the pedestal and arranged to receive the condensateaccumulating upon and discharging from the exterior surface of the arm.

4. In dental apparatus, a hollow pedestal having a body portion providedwith an opening, drip catching means overlying the body of the pedestaland including a portion surrounding the axis of the opening, a hollowliquid receiving arm overlying the drip catching means and having itsoutlet end disposed adjacent the opening, and a discharge conduitcommunicating with the outlet its end of the arm through the opening,said drip catching means being arranged to receive the condensateaccumulating upon and dripping from the exterior sur ace of the arm.

5. In dental apparatus, a hollow pedestal having a body portion providedwith an opening, a hollow arm overlying said body portion and having itsoutlet end in registry with the opening, a discharge conduit within thepedestal communicating with the outlet end of the arm through theopening, means on the arm for receiving a supply of liquid arranged todeliver the liquid to the arm for discharge therethrough, liquid supplymeans extending through said opening and discharging into the liquidreceiving means on the arm, and means overlying the body of the pedestaland extending beneath the arm arranged to receive the condensateaccumulating upon and discharging from the exterior surface of the arm.

6. In dental apparatus, a hollow pedestal having a body portion providedwith an opening, a hollow arm overlying said body portion and having itsoutlet end in registry with the opening, a discharge conduit within thepedestal communicating with the outlet end or" the arm through theopening, means on the arm for receiving a supply of liquid arranged todeliver the liquid to the arm for discharge therethrough, a receptacleinterposed between the outlet end of the arm and the portion of thepedestal having the opening therein, the receptacle being arranged toreceive the condensate accumulating upon and discharging from theexterior surface of the arm, and means for receiving and carrying oil"the liquid accumulating within the receptacle.

'7. In dental apparatus, a hollow pedestal having a body portionprovided with an opening, a hollow arm overlying said body portion andhaving its outlet end in registry with the opening, an outlet conduitwithin the pedestal communicating with the outlet end of the arm throughthe opening, means on the arm for receiving a supply of liquid arrangedto deliver the liquid to the arm for discharge therethrough, areceptacle interposed between the pedestal and the arm arranged toreceive the condensate accumulating upon the arm and dischargingtherefrom, and means arranged to receive from the receptacle thecondensate discharging thereto and to deliver the same to said outletconduit.

8. In dental apparatus, an upstanding pedestal, a hollow arm connectedwith and arranged to swing upon the pedestal, a receptacle on the arm incommunication therewith, means for delivering liquid to the receptaclefor discharge through the arm, and means mounted upon the arm to swingtherewith, said means underlying the arm and arranged to receive thecondensate forming upon and discharging from the exterior surface or"the arm.

9. In dental apparatus, an upstanding pedestal, a hollow arm connectedwith and arranged to swing upon the pedestal, a receptacle on the arm incommunication therewith, means arranged to deliver liquid to thereceptacle for discharge through said arm, receptacle beneath the armadjacent its point of connection with the pedestal, and a secondreceptacle underlying the arm and movable therewith, said receptaclesbeing arranged to receive the condensate forming upon and dischargingfrom the exterior surface or" the arm.

10. In dental apparatus, a hollow pedestal having an extension thereon,a drip-catching receptacle mounted upon said extension, a hollow armhaving its outlet end connected with the extension and overlying thereceptacle, a liquid discharge conduit projecting within the extensionand communicating with the outlet end of the arm, and a secondreceptacle beneath the arm arranged to receive the condensateaccumulating upon and discharging from a portion of the arm, said secondreceptacle being arranged to discharge the liquid received therein tothe first mentioned receptacle.

11. In dental apparatus, a hollow pedestal having an extension thereon,a drip-catching receptacle mounted upon said extension, a hollow armhaving its outlet end connected with the extension and overlying thereceptacle, a liquid discharge conduit projecting within the extensionand com municating with the outlet end of the arm, a second receptaclebeneath the arm arranged to receive the condensate accumulating upon anddischarging from a portion of the arm, said second receptacle beingarranged to discharge the liquid received therein to the first mentionedreceptacle, and a tubular member communicating with the first mentionedreceptacle and discharging to said conduit.

12. In dental apparatus, a hollow pedestal having an opening formed inits wall, a hollow arm connected with the pedestal and arranged to swingthereon about the axis of the opening, a discharge conduit communicatingwith the arm, means for delivering liquid to the arm for dischargetherethrough, a receptacle surrounding the axis of the arm adjacent thepoint of connection of the arm with the pedestal, and a secondreceptacle-secured beneath the arm arranged to swing therewith and toreceive the condensate accumulating on and discharging from the exteriorsurface of the arm, said last, mentioned receptacle being arranged todischarge the liquid received thereby to the first mentioned receptacle.

13. In dental apparatus, a hollow pedestal having an extension providedwith an opening, a liquid outlet conduit within the pedestal having itsreceiving end connected with the extension within the opening, a hollowarm connected at one end with said conduit end, a basin on the arm incommunication therewith, means'for delivering liquid to the basin, areceptacle on the extension surrounding the receiving end of the outletconduit, and a second receptacle extending beneath the arm and arrangedto receive the com densate accumulating upon and discharging from thearm and to deliver the same to the first mentioned receptacle.

14. In dental apparatus, a hollow pedestal having an opening in its wallprovided with a surrounding seat, a receptacle positioned upon the seat,a ring disposed upon the wall of the receptacle, a tubular mountingelement disposed within the opening of the pedestal and having a 19 partserving to hold the ring on the receptacle, adjustable means connectedwith the mounting element for securing it upon the pedestal, a hollowarm having one end connected with the ring and communicating with saidmounting element, a liquid discharge conduit connected with the mountingelement, and means for delivering liquid to the arm, said receptaclebeing arranged to receive a portion of the condensate accumulating uponand discharging from the exterior tubular mounting element disposedwithin the opening of the pedestal and having a part serving to hold thering on the receptacle, adjustable means connected with the mountingelement for securing it upon the ring, a hollow arm having one endconnected with the ring and communicating with said mounting element, aliquid discharge conduit connected with the mounting element, means fordelivering liquid to the arm, said receptacle being arranged to receivea portion of the condensate accumulating upon and discharging from theexterior surface of the arm, a second receptacle overlying the body ofthe pedestal and extending beneath the arm arranged to receive a portionof the condensate accumulating upon and discharging from the arm, thefirst mentioned receptacle being arranged to discharge the liquidreceived therein to the second mentioned receptacle, and means forconveying the liquid from the second mentioned receptacle to thedischarge conduit.

16. In dental apparatus, a pedestal, a hollow arm connected with thebody of the pedestal, a cuspidor bowl on the arm communicatingtherewith, an outlet conduit connected with the arm, valve meansconnected with the arm, a water supply conduit leading through thepedestal to and from the valve means for control by the latter andarranged to discharge into the cuspidor bowl, and a receptacleunderlying the arm arranged to receive the condensate accumulating uponand discharging from the arm.

1'7. In dental apparatus, a pedestal, a hollow arm connected with thebody of the pedestal, a cuspidor bowl on the arm communicatingtherewith, an outlet conduit connected with the arm, a receptacleextending above a portion of the body of the pedestal and underlying thearm arranged to receive the condensate accumulating upon and dischargingfrom the arm, valve means on the arm, a water supply conduit leadingthrough the pedestal and the receptacle to and from the valve means forcontrol by the latter arranged to discharge into the cuspidor bowl, anda drain pipe extending from the receptacle and connected with saidoutlet conduit.

18. In dental apparatus, a pedestal provided with an opening in its wallhaving a surrounding seat, a drip-catching receptacle on the seat, ahollow arm having its outlet end in registry with the opening, a tubularmounting element within the opening communicating with said outlet endof the arm and connected therewith, a discharge conduit leading from themounting element, a liquid holding receptacle on the arm, and meansarranged to deliver liquid to the last mentioned receptacle.

19. In dental apparatus, a pedestal having an opening in its wall, ahollow arm extending above and having its lower end overlying theopening, a drain pipe within the pedestal communicating with the lowerend of said arm through said opening, a discharge conduit leading fromthe mounting element, a receptacle beneath the arm arranged to receivethe condensate accumulating on and discharging therefrom, a secondreceptacle on the arm communicating therewith, and liquid supply meansarranged to discharge into said last mentioned receptacle.

20. In dental apparatus, a pedestal having an opening in its wall, ahollow arm having its outlet end overlying the opening, a receptacle onthe arm communicating therewith, a tubular mounting element within theopening communicating with the outlet end of said arm and rotatablyreceiving the arm, a discharge pipe leading from said mounting element,a water supply pipe extending upwardly through the pedestal and having aterminal portion within the mounting element on the pivotal axis of thearm, valve means within the arm, a conduit beneath the arm having itsinner end extending through the wall of the arm and rotatably receivedby the terminal portion of the supply pipe and having its upper endconnected with said valve means, a drip catching receptacle beneath thearm and conduit adapted to receive the condensate accumulating upon anddischarging from said arm and conduit and a conduit extending from andcontrolled by the valve means arranged to discharge within the firstmentioned receptacle.

21. In dental apparatus, a pedestal provided with a hollow extension, ahollow arm having an outlet end overlying the extension, a tubularmounting element within the extension communicating with and connectedto the outlet end of the arm, a conduit leading from the tubularmounting element, a liquid holding receptacle mounted on andcommunicating with the arm, liquid supply means adapted to discharge theliquid into the receptacle comprising a conduit projecting upwardlythrough the pedestal and through the mounting element into the arm andhaving an angular connection extending through the wall of the arm, anda drip catching receptacle underlying said arm and said connectionadapted to receive the condensate accumulating upon and discharging fromsaid arm and connection.

22. In dental apparatus, a pedestal having an opening in its wall, ahollow arm having one end overlying said opening, a tubular mountingelement within the pedestal communicating with and rotatably receivingsaid arm end and serving to connect it with the pedestal, a dischargeconduit leading from the mounting element, a receptacle on the armcommunicating therewith, liquid supply means arranged to discharge intothe receptacle comprising a conduit extending into said end of the armin coaxial relation therewith and having an extension projecting throughthe wall of the arm and adapted to swing with the latter about the axisthereof, and a drip catching receptacle underlying said arm and theextension of said conduit and adapted to receive the condensateaccumulating upon and discharging irom the arm and the extension.

23. In dental apparatus, a pedestal having an opening in its wall, ahollow arm having its outlet end overlying the opening, a tubularmounting element within the opening communicating with the outlet end ofsaid arm and rotatably receiving the arm, a discharge conduit leadingfrom the tubular mounting element, a receptacle on the arm communicatingtherewith, water supply means arranged to discharge into the receptaclecomprising a fixed pipe extending into the mounting element on the axisof the arm and having a rotary extension projecting exteriorly of thearm and discharging into the receptacle, and a drip catching receptacleunderlying said arm and said rotary extension adapted to receive thecondensate accumulating upon and discharging from the arm and the rotaryextension.

24. In dental apparatus, a pedestal, a tubular arm for receiving anddischarging liquid, said arm being connected with the pedestal andextending above a portion thereof and having an outlet for the liquid inits lower end, and drip catching means underlying the arm adapted toaccumulating upon and discharging from the" arm.

26. In dental apparatus, a pedestal, a tubular arm for receiving anddischarging liquid, said arm being connected with the pedestal andextending above a portion thereof, a drain pipe connected with the arm,drip catching means overlying said portion of the pedestal including areceptacle inserted between the arm and pedestal at their point ofconnection, and a drain tube leading from the drip catching means anddischarging within the drain pipe.

OSCAR H. PIEPERA

